and president obama en route along with former president george w. bush. rare they're on air force one together. decided to get a ride. >> hitched a ride. they're going to be joined, of course, by former presidents bill clinton who was also close to any son mandela, as you said, and jimmy carter, too. he's going for the memorial service. some other world leaders who plan to attend for mr. mandela are the u.n. secretary-general ban ki-moon, david cameron, prince charles is going. the french president, francois hollande and even the cuban president, as we said he had ties with cuba in the past, raul castro, list goes on and on of dignitaries. >> of course, with president obama and three of his predecessors going to south africa, you can imagine what robin was talking about, and that is security and the kind of complex situation they're dealing with potentially a nightmare. secret service had very little time to prepare for the trip. athena jones is joining us at the white house. we're very much aware of what it takes. there's not a lot of advance work when y